- Make sure the Compounds are no where close to your other sensory organs, remember that only your eyes are protected by the Goggles. -If a compound is spilled, wipe it up immediately and tell the instructor. Materials : powder forms of these compounds - LiNO3 - NaNO3 - KNO3 - Ca(NO3)2 - Ba(NO3)2 - - Unknown compound A - Unknown compound B - Goggles, Bunsen burner, distilled water, Q-tips, paper towel and a striker. Procedures 1- Turn on the Bunsen burner around the 45 degree angle. 2- Feel the gas on the top of the Bunsen burner with your hands, adjust if too high or too low.
By standing too close to the sink it may spread any contamination to your cloths. Then, turn on the faucet and adjust the temperature so that the water is warm. If the water temperature is too hot or too cold it can dry out and chap your skin causing your skin to crack and cracked skin can allow infections into your body. Then, wet your hands by placing them under the flow of water, apply liquid soap, and work soap into a lather by rubbing your palms together and rub the soap in between your fingers for at least thirty seconds. Rubbing your hands together helps in the removal of microorganisms and other germs from the surface of your skin.
· Broth culture of E. coli · Tubes of sterile nutrient broth · Inoculating loop · Bunsen burner · disinfectant Procedure 1. Disinfect the work surface by spraying it down with a disinfectant and then wipe with paper towel 2. Light Bunsen burner 3. Sterilize inoculating loop by holding it over the flame of the Bunsen burner until the tip becomes bright red. 4.
The watch glass was removed with the beaker tongs. Using a rubber bulb and a stirring rod to stir the solution continuously, 15.00mL of .25M BaCl2 solution was added to the solution in the beaker. The watch glass is replaced and the solution is keep hot but not boiling for 15 minutes. The precipitate was allowed to settle. When the liquid above the precipitate was clear, the solution was tested for completeness of precipitation when a few drops of BaCl2 solution were added from a pipette.
3. Evaluate the hypothesis and the procedure performed. Hypothesis: If the mass of the metal is greater, then the temperature change of the water will increase. Safety: Glasses must be worn, and loose clothing restrained for the Lab Exercise! Materials: 250mL Beaker Test Tube Calorimeter Burner, Ring Stand, and Wire Gauze Thermometer Balance Procedure: 1.
This colour can be used to determine which ion is being burnt as each ion emits a certain specific combination of wavelengths which correspond to specific colours. Variables: Independent Variable: Metal Salt Dependent Variable: Colour of the flame Controlled Variable: Quantity of the metal salt taken. Apparatus: * Safety goggles * Latex gloves * Nichrome wire * Bunsen burner * Hydrochloric acid * Wash bottle(with distilled water) * some metal salts > sodium chloride > sodium carbonate > sodium sulphate > lithium chloride > potassium chloride > potassium sulphate > strontium chloride > calcium sulphate > calcium carbonate > calcium chloride > copper carbonate > copper chloride * Spectroscope * Cobalt glass Safety Precautions:- * Safety goggles and latex gloves must be worn. * Hydrochloric acid is corrosive and can cause severe injury. If you spill acid on yourself, immediately flush the affected area with water for 2-3 minutes and notify the teacher.
Variables: 1. Independent - Type of nut 2. Dependent - Change of nut mass, Rise of temperature in water 3. Constant - Vessel (copper), Starting water temperature, Surrounding temperature Fair test:  There should be no errors in the measuring the volume of water  Weigh the nut correctly  Copper heats very quickly and the thermometer should not touch it as there will be a big error  The nut should be held in the same place as far as possible Method: 1. Take a nut, and weight it using the top pan balance.
Assignment 1 – Quantitative and Qualitative Techniques Task 1 (P1) – Analytical Techniques – i) Flame Test Introduction In this particular flame test, we are finding out the identity of the contaminant and the amount of it present in a brand off baked beans. Purpose of Technique The purpose of this test is to identify the metal ion. When a metal salt solution is burned, the metal provides a coloured flame. How it works Different metallic salts produce different colours when heated in a flame. This is due to the different atomic emission spectra produced when electrons in ions of different elements are excited.
We were dealing with bacteria that has the ability to be harmful and to avoid illness/sickness we need to thoroughly wash our hands and be careful around the bacteria. Another precaution to take was to not cough into or put any bacteria from our bodies into the agar plate. Those bacteria could be extremely dangerous and shouldn’t be cultivated. Observations Located on final page(s) Application Questions 1. The purpose of heating the agar plates in the autoclave prior to inoculating them with microorganisms was to make sure that the lab results were exact.
These impurities include vanadium, arsenic, zirconium, iron, silicon, and magnesium. Therefore, impure titanium tetrachloride is then cleaned of all these impurities for the purpose of gaining a pure titanium tetrachloride. The cleaning process is initiated by allowing the former mixture to settle, where the undissolved particles are removed as dirt or mud. Afterwards, the liquid that contains several chlorides is passed through a distillation column and is chemically treated with hydrogen sulfide or mineral oil to eliminate vanadium oxychloride, which is a chloride that boils at the same temperature as titanium tetrachloride. Finally, it is redistilled again to further purify the titanium tetrachloride produced.